Step to step method:
First you have to get the equipment from the list above.
Then put on your safety goggles.
We set up the equipment.
Then added the amount of thio, hydro and water.
We stirred it 10times.
Then started the timer.
We waited till the solution was cloudy.
To make sure it was the same each time we put a black cross underneath it and recorded when you couldn’t see the black cross.
We carried out all the different volumes of solutions then recorded it into out tables. The different volumes depended on which test we were doing. On test 1 Volume of thio was 25ml, volume of acid was 25ml and volume of water was 0ml. On test 2 Thio was 20ml, acid was 25ml and water was 5ml. After each test the volume of thio went down, the acid stayed on 25ml and the volume of water rises by 5ml, until we had 5ml of thio and 25ml of water.
If a result didn’t fit in we done it again.
Fair Test:-
To ensure that the test was far we kept the temperature the same the acid the same and the type of Thio and water the same but not the volume.
Precise and Reliable Readings:-
To ensure that I got precise and reliable readings I will make sure that the water I use is pure, I don’t mix the beakers up and finally that I repeat each experiment 3 times. These points will help me get precise and reliable readings.
Prediction:-
I think that as less Thio is added and more water is added the times will increase. I say this because when there is more Thio the solution is less concentrated and it is just to acids working together. However when the water is added and the Thio is decreased the solution will be more concentrated therefore taking longer to have a reaction as it is now harder for the particles to collide.
Results:-
Conclusion:-
From my results I can see as more water is added and less Thio is added the time for the cross to disappear will be longer. This is because there are less thio particles because it is diluted with water therefore it causes the thio and acid particles to react slower with each other.
Evaluation:-
We did the test 3 times to see if we had any odd results. The odd results are coloured in blue. We then repeated them at the end to make them more accurate and clear. I think two things that made it inaccurate are measuring the volume of water and thio incorrectly, also when we were looking out for the cross to disappear, when my partner thinks the cross has disappear I can still slightly see it. I think this is a very inaccurate way to carries out this experiment.